EV1542DK-00A 查看數據表（PDF） - Monolithic Power Systems
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EV1542DK-00A Datasheet PDF : 10 Pages
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MP1542 – 700KHz/1.3MHz BOOST CONVERTER WITH A 2A SWITCH
PIN FUNCTIONS
Pin # Name Description
1 COMP Compensation Pin. Connect a capacitor and resistor in series to ground for loop stability.
2
FB Feedback Input. Reference voltage is 1.25V. Connect a resistor divider to this pin.
Regulator On/Off Control Input. A high input at EN turns on the converter, and a low input turns
3
EN it off. When not used, connect EN to the input source (through a 100kΩ pull-up resistor if VIN >
6V) for automatic startup. EN cannot be left floating.
4 GND Ground.
5
SW
Power Switch Output. SW is the drain of the internal MOSFET switch. Connect the power
inductor and output rectifier to SW. SW can swing between GND and 25V.
6
IN Input Supply Pin. IN must be locally bypassed.
7
FSEL
Frequency Select Pin. Tie to IN (through a 100kΩ resistor if VIN > 6V) for 1.3MHz operation or to
GND for 700KHz operation.
8
SS
Soft-Start Control Pin. Connect a soft-start capacitor to this pin. The soft-start capacitor is
charged with a constant current of 6µA.
OPERATION
The MP1542 uses a constant frequency, peak
current mode boost regulation architecture to
regulate the feedback voltage.
The operation of the MP1542 can be
understood by referring to the block diagram of
Figure 1.
IN
6
EN 3
INTERNAL REGULATOR
AND ENABLE CIRCUITRY
FSEL 7
OSCILLATOR
SS 8
+
PWM
CONTROL
LOGIC
--
CURRENT
SENSE
+
AMP
--
GM
+
--
1.25V
MP1542 Rev. 1.2
12/14/2005
Figure 1—Functional Block Diagram
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
5 SW
4 GND
2 FB
1 COMP
MP1542_BD01
5
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